Provide datadog metrics on component draftset operations

[RickMoynihan]

We currently give datadog metrics on drafter.sparql.update.time which reports metrics on arbitrary sparql updates.

https://github.com/Swirrl/drafter/blob/master/drafter/src/drafter/rdf/sparql.clj#L40

It would be useful to break this down by operation too, to give us a little more visibility on what is happening and where time is spent.

The above function is called from approximately 21 other call sites e.g.

• drafter.backend.draftset.draft-management/upsert-single-object!
• drafter.backend.draftset.operations/delete-draftset-statements!
• ...

I think it makes sense to wrap a datadog/measure! over most (if not all) of these call sites to provide more visibility, on what is happening; and then surface this in our datadog boards.